What is the smallest animal?
I think it is the humming bird.. or some kind of plankton

http://en.wikipedia.org/wiki/Mycoplasma_genitalium

Mycoplasma genitalium is a small parasitic bacterium which lives on the ciliated epithelial cells of the primate genital and respiratory tracts. M. genitalium is the smallest known free-living bacterium, and the second-smallest bacterium after the recently-discovered endosymbiont Carsonella ruddii. Until the discovery of Nanoarchaeum in 2002, M. genitalium was also considered to be the organism with the smallest genome (aside from viruses). See link above


According to the San Diego Zoo web site, the smallest animal in the world are Plankton which are microscopic plants and animals.

http://www.sandiegozoo.org/animalbytes/got_questions_large_small.html

 

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